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stock 2004r + mods behind 380hp 355sbc?

 
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RaG
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Joined: 20 Dec 2002
Posts: 85

296.96 points



PostPosted: Mon Apr 12, 2004 10:27 pm    Post subject: stock 2004r + mods behind 380hp 355sbc? Reply with quote

I have a stock 2004r with a bad T/C, bad vibration. Trans shifts fine, doesn't slip, no trash in the pan.

I'm thinking of putting it in my car with a new 2400rpm stall, proably buy me a shift kit and a TCI full auto valve body just because i get huge discounts on TCI stuff.

Think it will last behind my est 380hp 355? (motor in signature)

Just street use, on 8" wide street tires
Have a good trans cooler on already.

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71 Chevelle
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jeep_406
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Joined: 12 Sep 2002
Posts: 1667
Location: Tewksbury, Mass 01876
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1972 Chevrolet Nova

PostPosted: Tue Apr 13, 2004 12:17 am    Post subject: Reply with quote

I'm an overkill kind of guy. I hate to do anything twice. I'd pull the tranny apart and go through it. I also think I'd put a little more converter in it.
A good unit would work nicely with the gear you are running and the overdrive would make it driveable on the highway.
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Tue Apr 13, 2004 9:28 am    Post subject: Reply with quote

jeep_406 wrote:
I'm an overkill kind of guy. I hate to do anything twice. I'd pull the tranny apart and go through it. I also think I'd put a little more converter in it.
A good unit would work nicely with the gear you are running and the overdrive would make it driveable on the highway.


I agree with jeep.
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Tue Apr 13, 2004 8:39 pm    Post subject: Reply with quote

Here is a reply I sent to another member concerning a swap, but it does cover most of what you are looking for. I had to do a search and copy paste because it is starting to get a little fuzzy.

You will love the 200r4. Ran one for years behind several engines. I built it myself and here is what I had in it. There is a local transmission supply company called Cadco and this is where I got all of my parts. I put in a basic rebuild kit with standard clutches and steels, standard band, Grand National servo, a 10 vane upgrade kit, hardened stator support shaft (most factory ones weren't), and a hardened input drum (factory ones weren't). These parts were roughly $150 (been about 3 years, so I'm not exaclty sure, but this is close). The shift kit you have to have is made by Transgo, and by the price, this is probably what you are looking at. Tried a B&M before Transgo, and there is no comparison. I didn't get any particular model transmission, but I did cut down the spacer rings between the piston and pressure plate to get the maximum number of clutches in each pack. This is a must in the forward and direct drums. Had a 10" non lock up converter with about 3000-3200 stall. If you run a non lock up converter there is a valve you will have to change in the pump to provide circulation through the cooler. Ran this behind a decent 350 with nitrous for a while, then the same 350 with a Procharger until I got greedy and puked it. Next came a 383 with a Procharger, then the same 383 with nitrous so I woundn't puke it. On Street tires, there wasn't a problem, but with slicks, all shifts would get kinda spongy. This was in a 3700 lb car running high 10's, so in a street car situation you shouldn't have any problems. It will be great with a 4.11 gear and will be a tire burner. It has a 2.75 low, second is different, but I can't remember exactly what it is (1.57 I think), direct third of course, and a 0.7 overdrive. They are a pretty tough transmission, and will bolt right in place of the 350 with the same driveshaft. Use a crossmember for a 400 if one was offered in your car. I finally had to go to a 400 and I sure do miss my overdrive. Good luck.

As far as the lockup, I tried the simple B&M kit with a vacuum switch and didn't like it. Summit lists one that looks like it uses a speed transducer installed in the speedometer cable that I think would work much better. I think your El Camino has a full frame and you may be able to slide the cross member back far enough. If not, find a crossmember for a 400. It will be very close. (Within 1/2 hole) The transmission mount off of the 350 will work. If you need any more info, let me know. Clay
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